Anonymous
Anonymous asked in Science & MathematicsChemistry · 6 years ago

Need Help With Grade 12 Chemistry Question!?

PCl5(g)↔PCl3(g)+Cl2(g)

2.5 M of phosphorus pentachloride are mixed with 0.60 M of phosphorus trichloride and chlorine. Will a reaction occur? In which direction will the reaction occur? If K250℃=0.042, what are the final equilibrium concentrations?

1 Answer

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  • OCV
    Lv 6
    6 years ago
    Best Answer

    K = (c(PCl3)* c(Cl2)) / c(PCl5)

    Put in the values and solve K, if K is greather than 1, the reaction will occur.

    For the second question, you need to calculate all concentrations.

    K = 0,042

    c(PCl5) = c0 -x

    c(PCl3) = c0 + x

    c(Cl2) = c0 +x

    K = [ (c(PCl3)+x)* (c(Cl2))+x) / (c(PCl5)-x) ]

    Now solve for x, you'll get a quadratic equation. However, only one solution for x will be the right one (the other one will make the concentrations negative)

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